3v OU Flashlight

[magpwr]

hi TinselKoala,

I have attached scope shot of 2N2222a and ZTX857 (300volt transistor)

The duty cycle for 2N2222a would have to be reduced to 3% instead of 5% to maintain similar current consumption around 6mA.

The ZTX857 (300volt transistor )needs just 1% duty cycle to get around 316volts at around 6mA at 5% duty cycle it would be around 12mA.

Another interesting thing to note at 43Khz which is injected via transistor to primary coil of 17 turns would get me maximum voltage of 3volts at secondary 61 turns.
I have controlled the duty cycle to <20% to get 3volts at secondary at the same time to consume low current.

Since i did not get the MC34063 to test,lets assume if i were to tweak the output frequency from MC34063 at pin 1 to 43KHZ ,maybe by changing to suitable cap or adjusting voltage.
Then maybe this 3volts which would be present at 61 turns secondary would be amplified by the back emf by switching transistor."This is just my unconfirmed theory"

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Lastly base on recent Akula video lighting Led with flyback (NO PSU).If you noticed carefully there is 2 PWM I/C might be TL494 since there is 2 timing capacitor which is connected to the same pin for 2 I/C.
There 5 tuning knob.One i/c have duty cycle with frequency control and another I/C have the same thing but with additional fine tuning for frequency(Total 5 tuning).
I don't how mixing 2 frequency on 2 separate primary coil of flyback which connected to one end likely connected to positive supply can generate ou after looping back from secondary coil.

If you study 3volt ou flashlight circuit there should be 2 different frequency as well.

I have merely presented back emf around 10hz signal from I/C 4069 .(Bare in mind keep duty cycle low) .

Once i received MC34063 and larger 4.7cm diameter ferrite core i will complete the circuit.

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This is my latest findings using 4069 Photo and video attached.10uf capacitor unchanged in circuit with current consumption around 38mA using 3.9volt(Li-ion AA battery size)."I would need to use 3volts later on"

This is very interesting discovery i just made upon tuning 4069 to around 11.8hz..12hz suddenly there would be a bigger spike which appear and remain high as attached.The rest of the smaller ones is 20volts.

[TinselKoala]

@magpwr:

Thanks for doing those tests. It looks like the 2n2222a is doing almost the same thing as the 2sc1815. I just woke up, haven't yet had my morning coffee. I'll be thinking about this and doing some fiddling around later today.

Thanks again... cheers!
--TK

[verpies]

Wesley Translates Akula video #16: Akula's TPU part 5
https://www.youtube.com/watch?v=Lpx1SJdXnmo&feature=youtu.be

Thanks for your translation effort.

How are the copper foils connected to the windings?
Like this?

[TinselKoala]

The data sheet for the MC34063A is very interesting.

[verpies]

Do you find the V_CE Max = 40V interesting?

Since there is 80V (sometimes 110V) across the collector-emitter junction of the MC34063's output transistor, this voltage exceeds its maximum V_CE rating by over 200% and suggests that reversible avalanche breakdowns of this junction is occurring.
This reminds me of Itsu's and mine avalanche nanopulse generator.  See this video and this one..

Perhaps the observed train of pulses are several C-E avalanche breakdowns in quick succession.

P.S.
Weren't nanopulses deliberately used in the Dally contraption?